Method and apparatus for molding polyurethane foam

Details Method and apparatus for molding polyurethane foam Method and apparatus for molding polyurethane foam

B - Operations, Transporting

29

C

B29C 67/20 (2006.01) B29C 44/34 (2006.01) B29C 44/60 (2006.01) B29C 45/00 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2044232

Disclosed herein is a method and apparatus for producing a molded polyurethane foam without using low-boiling solvents such as Freon and methylene chloride which present problems when used as a blowing agent. The polyurethane foam has the same good appearance and soft feeling as that produced with low-boiling solvents. A polyurethane foam is produced by injecting a polyurethane material into an evacuated cavity and permitting it to expand so that it flows and fills the cavity, said polyurethane material being composed of 100 parts by weight of polyol component and 0.1-0.6 part by weight of water as a blowing agent. The cavity pressure may be maintained high spontaneously or low while the polyurethane material is flowing in the cavity. When the polyurethane material has reached the final fill position in the cavity, the fore-end of the polyurethane material is discharged from the cavity.

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